Power Tool Dust Collector Mounting to Prevent Motor Vibration
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Solution Overview
Problem
Existing power tool dust collecting devices mounted on tools like hammer drills experience motor vibration, leading to rotor whirling and premature brush wear, which shortens the motor's lifespan.
Innovation Solution
A power tool dust collecting device with a housing that includes a motor chamber, fan chamber, and dust collecting chamber, featuring a cushioning member, such as rubber pins, interposed between the motor chamber's inner wall and the motor's outer surface to absorb vibrations, and a seal member to prevent dust from entering the motor chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the motor is held via ribs on the inner wall of the motor chamber, then the motor is securely mounted, but vibration is continuously transmitted to the motor causing rotor whirling and brush wear
Solution Approach 1:
A cushioning member made of elastic material is introduced as an intermediary between the motor and the motor chamber wall. This cushioning member absorbs vibration energy and prevents direct transmission of vibration to the motor, thereby reducing rotor whirling and brush wear while maintaining secure motor mounting
Solution Approach 2:
The cushioning member is pre-installed between the motor and the motor chamber wall to provide vibration absorption before the motor operates. This beforehand cushioning prevents vibration transmission from occurring in the first place, protecting the motor from premature wear
2Reliability
If rubber pins are used as cushioning members arranged in parallel with the output shaft, then motor vibration is suppressed, but the device complexity increases
Solution Approach 1:
The cushioning member is divided into multiple discrete rubber pins arranged in parallel with the output shaft at predetermined intervals. This segmentation allows the cushioning function to be distributed across multiple simple elements rather than requiring a single complex structure, achieving effective vibration suppression while maintaining relatively simple device architecture
3Object-affected harmful factors
If a seal member is provided on the partition wall opening, then dust is prevented from entering the motor chamber, but the device complexity increases
Solution Approach 1:
The sealing function is extracted as a separate, dedicated component (seal member) that can be independently installed on the partition wall opening. This allows dust prevention to be achieved through a simple, focused sealing element rather than integrating sealing into the main housing structure, minimizing the increase in device complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively suppresses motor vibration, preventing rotor whirling and brush wear, thereby extending the motor's life and reducing the cost of the cushioning member by using fewer rubber pins, while also preventing dust from entering the fan chamber.
Implementation Method 1
The cushioning member is interposed between an inner wall of the motor chamber and an outer peripheral surface of the motor... even when vibration generated during operation of the power tool is transmitted to the housing, the vibration can be prevented from being transmitted to the motor, owing to the cushioning member
Implementation Method 2
A rubber pin to be used as the cushioning member is provided in a plurality, and the plurality of rubber pins are arranged in parallel with the output shaft at a predetermined interval along the outer peripheral surface
Data Source
AI summary
A power tool dust collecting device includes, in a housing in which a suction opening is protrudingly provided and on which a power tool is mountable, a motor chamber holding a motor having a brush that comes into sliding contact with a commutator of a rotor rotating integrally with an output shaft, a fan chamber housing a dust collecting fan attached to the output shaft of the motor, and a dust collecting chamber in which a filter, through which passes air sucked up from the suction opening due to rotation of the dust collecting fan in accordance with driving of the motor and which collects dust in the air, is mounted on an upstream side of the fan chamber. A cushioning member is interposed between an inner wall of the motor chamber and an outer peripheral surface of the motor.